摘要:
Process for manufacturing a container (2) from a plastic preform (3) by blow-molding in a mold (11), comprising: an operation of introducing the preform (3) into the mold (11); a blow-molding operation consisting of pressurizing the preform (3) by introducing a gas under a blow-molding pressure into it; a flushing operation subsequent to the blow-molding operation consisting of partially pressurizing the container (2) by introducing a gas under a flushing pressure lower than the blow-molding pressure into it; an operation of at least partial depressurization of the container down to a pressure lower than the flushing pressure, wherein this depressurization operation is subsequent to the blow-molding operation and prior to the flushing operation.
摘要:
Method of manufacturing a container from a blank of plastic material, within a mold provided with a wall defining a cavity with the impression of the container, and a mold bottom that is movable with respect to the wall between a retracted position and a deployed position in which it extends protruding into the interior of the cavity in order to form a hollow recess in the container. The method includes inserting the blank into the mold; a pre-blowing operation including injecting a fluid under pressure into the blank, at a pre-blowing pressure; a blowing operation including injecting a fluid under pressure into the blank at a blowing pressure that is greater than the pre-blowing pressure; and a boxing operation, initiated prior to the blowing operation, and including moving the movable mold bottom from its retracted position to its deployed position.
摘要:
Polymer container (2), having an inside wall (42) and an opposed outside wall (43), the crystallinity rate of which exhibits a negative gradient of the side of the inside wall (42).
摘要:
Process for forming containers from a blank, preferably a preform, made of a thermoplastic, the containers being formed using a stretch-blow moulding machine of rotary type having a blow-moulding mould mounted on the periphery of a carousel rotated continuously about its axis, the blow-moulding mould operating in cyclic manner according to a blow-moulding cycle having the following steps: placing a preheated blank in a blow-moulding mould; closing the blow-moulding mould; blowing the blank in the blow-moulding mould; flushing the inside of the container with a cooling gas, by injecting air thereinto; grasping the blow-moulded container by external gripping means; and opening the blow-moulding mould, which process includes automatically varying the duration of the flushing step at each start of production of the containers, in a temporary and evolving manner for a few minutes to establish in the containers thermal conditions enabling the first containers to be formed at a temperature that gives them a final volume corresponding to the final volume of the containers formed during the stead-state operation of the stretch-blow moulding machine.
摘要:
A method of manufacturing a container from a blank in a stretch blowing assembly equipped with a mold provided with a wall and a mold bottom axially movable between an extended position and a retracted position and a stretch unit having a rod axially movable with respect to the wall and a device for controlling the movement of the rod. The method involves a stretch blowing phase; a boxing phase during which the mold bottom, initially in the extended position, is moved towards its retracted position, the boxing phase having a retraction operation including controlling a movement of the rod in synchronization with the movement of the mold bottom, or releasing the rod to allow the free axial movement thereof.
摘要:
Method of manufacturing a container from a blank of plastic material, within a mold provided with a wall defining a cavity with the impression of the container, and a mold bottom that is movable with respect to the wall between a retracted position and a deployed position in which it extends protruding into the interior of the cavity in order to form a hollow recess in the container. The method includes inserting the blank into the mold; a pre-blowing operation including injecting a fluid under pressure into the blank, at a pre-blowing pressure; a blowing operation including injecting a fluid under pressure into the blank at a blowing pressure that is greater than the pre-blowing pressure; and a boxing operation, initiated prior to the blowing operation, and including moving the movable mold bottom from its retracted position to its deployed position.
摘要:
A method of manufacturing a container from a blank in a stretch blowing assembly equipped with a mold provided with a wall and a mold bottom axially movable between an extended position and a retracted position and a stretch unit having a rod axially movable with respect to the wall and a device for controlling the movement of the rod. The method involves a stretch blowing phase; a boxing phase during which the mold bottom, initially in the extended position, is moved towards its retracted position, the boxing phase having a retraction operation including controlling a movement of the rod in synchronization with the movement of the mold bottom, or releasing the rod to allow the free axial movement thereof.
摘要:
Process for forming containers from a blank, preferably a preform, made of a thermoplastic, the containers being formed using a stretch-blow moulding machine of rotary type having a blow-moulding mould mounted on the periphery of a carousel rotated continuously about its axis, the blow-moulding mould operating in cyclic manner according to a blow-moulding cycle having the following steps: placing a preheated blank in a blow-moulding mould; closing the blow-moulding mould; blowing the blank in the blow-moulding mould; flushing the inside of the container with a cooling gas, by injecting air thereinto; grasping the blow-moulded container by external gripping means; and opening the blow-moulding mould, which process includes automatically varying the duration of the flushing step at each start of production of the containers, in a temporary and evolving manner for a few minutes to establish in the containers thermal conditions enabling the first containers to be formed at a temperature that gives them a final volume corresponding to the final volume of the containers formed during the stead-state operation of the stretch-blow moulding machine.
摘要:
Process for manufacturing a container (2) from a plastic preform (3) by blow-molding in a mold (11), comprising: an operation of introducing the preform (3) into the mold (11); a blow-molding operation consisting of pressurizing the preform (3) by introducing a gas under a blow-molding pressure into it; a flushing operation subsequent to the blow-molding operation consisting of partially pressurizing the container (2) by introducing a gas under a flushing pressure lower than the blow-molding pressure into it; an operation of at least partial depressurization of the container down to a pressure lower than the flushing pressure, wherein this depressurization operation is subsequent to the blow-molding operation and prior to the flushing operation.
摘要:
Bottom of hollow ware obtained by the blow moulding or stretch-blow moulding of a thermoplastic preform, this bottom having a transverse bearing surface and, on either side of this transverse bearing surface, a transverse external edge (7) and a concave internal wall with a transverse central portion (11) containing a disc (12) of material having a low crystallinity, this bottom including reinforcing ribs (1) having an outer edge (13) coming close to the transverse external edge (7) but without reaching this transverse external edge (7), these reinforcing ribs (1) hang an inner edge (14) coming close to the transverse central portion (11), but without reaching this transverse central portion (11), the transverse bearing surface being formed from segments (6a, 6b, 6c, 6d, 6e) interrupted by the reinforcing ribs (1), this hollow ware bottom (4) further including notches (2), the distal end portion (24) of which comes close to but does not reach the external edge (7) of the bottom, the proximal end portion (25) of the notches (2) being tangential with the transverse bearing surface but not opening into this transverse bearing surface.